Steam boiler and furnace



(No Model.) I 2 Sheets-Sheet 1.

. G. R. 8; G. A. AYER.

STBAM' BOILER AND FURNAGB. No. 498,606. Patented May 30, 1893.,

WIT E5555 S fifi 2 Sheets- Sheet 2.

(No Model.)

0. R. s..- G. A. AYE'R. STEAM BOILER AND FURNACE.

No. 498,606. Patented May 30, 1893.

, g.@.@.@.@.@- U f WITHEEEEE CALEB R. AYER, OF BOSTON, AND

GEORGE A. AYER, OF WORCESTER,

MASSACHUSETTS.

STEAM B OILER AND FURNACE.

SPECIFICATION forming part of Letters Patent No. 498,606, dated May 30, 1893.

Application filed July 30, 1892.

To all whom it may concern.-

Be it known that we, CALEB R. AYER, of Boston, in the county of Sufiolk, and GEORGE A. AYER, of Worcester, in the county of WVorcester, State of Massachusetts, have jointly invented certain new and useful Improvements in Steam Boilers and Furnaces, of which the following, taken in connection with the accompanying drawings, is a specification.

This invention relates to steam boilers of the downward-draft water-tube type, the fire box having its draft opening above the grate and the volatile products of combustion being deflected downwardly and all caused to pass through the incandescent mass of fuel on the grate where they are utilized as fuel or consumed in the combustion chamber be neath the grate. The highly heated current then travels by a circuitous path among a multiplicity of water-tubes connected at their ends to water-containing walls diverging as they rise and crowned by steam drums.

Our present invention consists in the combination with a water grate and a transverse water box with which all the tubes 'of said grate connect at the inner end of the fire-box, of a series of water-supply pipes below the grate extending from the lower portion of the front water wall obliquely upward through the combustion chamber to and into said transverse water-box, so as to supply therefrom water to the grate tubes which rise thence and connect with said water wall.

Our invention further includes water-containing front and rear walls for the water tubes, such walls being continuous from side to side of the boiler, each diverging from the bottom, upwardly, for complete clearance, and terminating in a transverse steam drum. It also embraces such continuous walls and terminal steam drums riveted longitudinally together at their edges and suitably stayed, in combination with inclined water tubes connecting said walls.

In the drawings, Figure 1 is a longitudinal vertical section through our improved boiler,

' and Fig. 2 is a front elevation thereof.

A is the water wall forming the front of the fire box, B B the feed doors and C the ash door therein.

D is a transverse water-leg, which forms Serial No. 441,645. (No model.)

the closed inner end of the fuel chamber and deflects downwardly the entire caloric current. This water leg or band extends transversely from side wall to side wall of the boiler, and communicates with the water-spaces therein.

The grate is composed of parallel water tubes E E E extending obliquely downward from the water wall A to the water-box F, which is made independent of the side walls of the boiler and lies adjacent to and parallel with the lower part of the water-leg D. Wa-

- ter for circulation through the grate tubes E is supplied to this water box through the enlarged oblique supply pipes G which descend from said box and enter the lower part of the ash-pit door 0.

H is the mainfeed-Water inlet pipe, and I I two branch pipes running therefrom through the combustion chamber to supply the firebox wall and the grate fed therefrom. By this construction water is drawn from the coolest part, where it is supplied from the inlet pipe and is heated as it moves through the combustion chamber and rises through the pipes G, by the intense current of combustible gases descending from the grate, and by the exceedingly high temperature of the combustion chamberbeneath the grate. It is further heated in the transverse water box, and in the grate tubes on which the fuel rests, the water continually rising and having free circulation as it advances.

The body of the boiler is filled in with a multiplicity of inclined water tubes J among cuitous path as indicated by the arrows, it being shown as deflected by a fire brick wall K in rear of the water leg D, by inclined firebrick slabs L, and by a depending water leg M in the upper portion of the boiler, toward the rear. The ends of the several water tubes J enter the inner plates of the front parallel to each other and at right angles to the tubes J, and hence somewhat inclined as compared with the Vertical front plate N of the front wall,the plates of each wall diverging as they rise to afford abundant clearance. The outer plate of the rearwall O is and rear water walls N, 0, these plates being.

front wallA of the fire box at each side of the which the caloric current travels in a cirthus still more inclined from a vertical position as seen in Fig. 1. The end walls N, O, are each continuous from side to side of the boiler, so that all the pipes J open into both of these walls. The pipes will be screwed or expanded into the inner plates, while the outer plates will have, opposite thereto, screw caps P to afford access to each tube. Similar caps for the supply pipes G, are shown in Fig. 2. The top of each wall N, O, is crowned by a nearly cylindrical steam drum Q to which their front and rear plates are firmly riveted, stay strips R being provided, at intervals from front to rear to support the parts against the pressure, as indicated in Fig. 1. Where the bottom portion of the drum is apertnred but not removed the metal remaining forms apartial stay. Each drum is furnished with a man-hole in its end or elsewhere. A series of enlarged horizontal pipes S connects the upper portion of the front and rear walls N, O, to equalize the pressure and for circulating pipes.

The front wall N being distinctfrom the. fire-box wall A, we provide for communica tion between them by water-pipes T rising from the upper part of the wall A and enter ingthe wall N above it, to give Y free circulation for the water rising I from the grate. These pipes Tare shown in Fig. 2 at each side only butthey may be placed, at intervals, on

the front also, if preferred. These pipes will be suitably sheathed to prevent cooling of the water or condensation of the steam therein.

Water is supplied to the rear wall 0, from the transverse main pipe H, through several upright tubes U as indicated in Fig. 1. We claim as our joint invention 1. In a downward draft boiler furnace, the upright water-leg D communicating with the set forth.

2. In a downward-draft water-tube boiler, the combination with a multiplicity of inclined water-tubes among which the caloric current is caused to pass, of front and rear water-containing walls extending continuously from side to side of the boiler, formed with parallel inner plates with which the ends of said water tubes engage, and with outer plates diverging upwardly in opposite directions from said parallel inner plates, substantially as and for the purpose set forth.

Y 3. In a downward-draft water-tube boiler, the combination with a multiplicity of inclined water-tubes and with front and rear.

water-walls having their respective outer and inner plates upwardly diverging, of steam drums riveted longitudinally to the upper edges of such diverging plates and suitably stayed, substantially as set forth.

In testimony whereof we have signed our names to this specification, in the presence of two subscribing witnesses, on this 5th day of July, A. D. 1892.

CALEB R. AYER. GEORGE A. AYER. WVitnesses:

VICTOR E. BURKE, ALFRED YOUNGS. 

